By Jill Barton Associated Press Writer BOCA RATON, Fla. (AP) - Six mating manatees were returning to the ocean Tuesday after beaching themselves in the surf off Boca Raton, officials said. Biologists said the five male manatees and one female manatee were showing a typical mating pattern, common during the summer. The manatees showed no recent wounds and appeared healthy, said Dr. Kirt Rusenko, a biologist with the city of Boca Raton who was on the scene. He said they were not in any danger. By mid-morning, two of the manatees had returned to the ocean and the other four...